Are you asking for more public subsidy for places which have fallen so far behind that no business can see a return on investment?
No, Skipness. As made abundantly clear in earlier postings I am calling for an equitable distribution of public sector funding for infrastructure investment. And that does not mean 13:1, 8:1 or even 5:1 in favour of London (depending on which statistical methodology you prefer). Please remember that the communities you propose to write off pay taxes to the exchequer at the same rates as Londoners. They deserve their fair share in return.
By the way, are you familiar with the concept that investment attracts investment? Invest some capital to improve an area's functionality and private investment will follow. London's Docklands is a fine example of this principle in action. There are many areas of the UK which would benefit from similar thinking.
Taking your own example of Scotland (which now has considerable control over its own infrastructure spending) we see the recently re-opened borders railway. It is too early to quote statistics, but the early signs are that communities all along that route will benefit from new investment as a result. Exactly the kind of project we need to back.